The dollar rose above the key threshold of 100 yen Thursday for the first time in four years. Jonathan Cheng joins the News Hub to explain what's behind the greenback's surge. Photo: Associated Press.

This transcript has been automatically generated and may not be 100% accurate.

... the the ... while the dollar now buys more than one hundred Japanese yen ... the first time in four years ... will have back and mall right and right now on the New Saab good afternoon and welcome I'm Simon Constable to discuss this historic move and the currency markets we got Jonathan Chan ... from the market's best on the bank's of being an ... people been waiting for this for a few weeks now and and and and it's finally happened but it is historic in its own ... look for twenty years Japan has legs down the rest the world both in terms of its economy as well as the stock market ... and of ... people keep looking for new prime minister and there's a new prime minister's ... party ... every every six months assume that there's a new prime minister but ... Ave on his second run here I think is really ... calm ... doing something different here and finally we're starting to see ... how the market really respond to it ... in in that city shows the the fall in the body of the Vagana relative to the dollar ... one dollar buys some slightly more than one hundred yen ... does not mean that basically bound to Japan's goods will now be cheap coffee rust a well ... yes and of course depend on the well known for its exports companies and the giant Santa ... they've been suffering because the yen has been so strong in recent years and and really it's on ... it's a good blend of any can see that on the stock market because ... of ... the Nikkei average is up about thirty five forty percent this year so ... aam ... clearly investors like this alot ... investors do one missile and on and know that that has been a push in the U S to be weak weak it all up ... aam and and Sunday we've we've seen a weaker dollar in many ways if every country in the well to take away ITF Mangan Abelow currency ... that doesn't work doesn't know it doesn't and of course that's what you hear talk of currency wars sometimes because ... you know in some respects this is a zero sum game that not everyone can can can play the same game the same time ... and at the same results from it ... but ... in all things being equal of Japan was the second largest economy in the world is now the third-largest NS been stagnant for so long ... that I think it's what the Bank of Japan has been doing around and ... you really see the fruits of that today ... aam ... has benefited ... out ... so far investors around the world who ... like the direction that this is going but you're right I mean if the ECB ... in your vet about Europe's atherectomy le gonna come out into the same thing as well ... and with the Bank of England for the slow lane and that the Fed continues to invest up ... to at some point yes we've reached the point where this is how nobody ... and in fact ... all the liquidity in the world of ... it's gotta go somewhere and we'll see what happens now twenty twelve wind that so ... that's another problem for another date but its big question that we're starting to ask for more more to see ... things like this happen another discussion